Try this


Code:
#include<stdio.h>

int main()
{
  int points;
  char decision;
  char deal;
  char play;

  printf ( "Welcome to Ben's blackjack game!\n" );
  printf ( "Would you like to play (y or n)\n" );
  scanf ( "%c", &play );
  if ( play == 'y' ) 
  {
      printf ( "Press d to deal, or press h for help\n" );
      fflush (stdin);
      scanf ( "%c", &deal );
      if ( deal == 'h' ) 
      {
         printf ( "In blackjack, the player aims to get 21 points each deal.They do this by getting cards of different values\n but if the player gets over 21 then they are bust         \n, which means they get 0\n" );
      }
      else
      {
         printf ( "Invalid Command\n" );
      }
  }
  else if ( play == 'n' ) 
  {
      printf ( "Ok then, bye!\n" );
  }
  else
  {
      printf ( "Invalid Command\n" );
  }
}
For any further doubt just post your doubt or something else?